Apple’s new macOS Sequoia update is breaking some cybersecurity tools

Apple’s macOS 15 (Sequoia) release has caused widespread compatibility issues for several security products—including CrowdStrike, SentinelOne, Microsoft Defender, and ESET—apparently due to changes in the network stack, prompting delayed support and warnings against immediate upgrades. Researchers and users reported DNS and firewall malfunctions and some Firefox browsing problems; vendors are awaiting Apple fixes or issuing their own updates, with no evidence of exploitation or data compromise.